No one is allowed (smoke) ______in public buildings according to the new regulation.

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问题 No one is allowed (smoke) ______in public buildings according to the new regulation.

选项

答案to smoke

解析 allow后面既可以跟doing sth.也可以跟to do sth.,前者表示当前的状态下,“允许对方做…”,不用于被动语态,而后者表示“将来允许做…”,可用于被动语态。故填to smoke。
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